Ammonites are extinct invertebrates that shared the same fate as the dinosaurs, going extinct at the end of the Cretaceous Period, 65 million years ago. Modern relatives of ammonites include the nautilus, squid, cuttlefish and octopus. Because ammonites lived exclusively in marine environments, their presence also indicates the location of prehistoric seas. Ammonites varied greatly in size. The largest known ammonites have been found in Europe and grew to massive sizes exceeding 2 meters (6.5 feet) across. This is the exception, of course. Average diameters throughout the ages showed that most ammonites grew to sizes not much larger than a man's hand. Some ammonites were only as large as 2 cm (0.75 inches) in diameter.

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Heteromorph or "uncoiled" ammonites are a type of cephalopod that are much more rare than typical solid coil ammonites. This type of heteromorph ammonite features an open coil with space in between each...

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Heteromorph or "uncoiled" ammonites are a type of cephalopod that are much more rare than typical solid coil ammonites. This type of heteromorph ammonite features an open coil with space in between each...

A major "first" and a "once-in-a-lifetime" fossil! This is a substantial natural concretion fossil, containing a large Placoderm armored fish skull with two associated Goniatite cephalopods. Over the last TWO DECADES of extensive work and...

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This massive naturally-colored ammonite is a member of the Procheloniceras species Cretaceous ammonites from the coastal village of Agadir, Morocco. It is a robust type and seldom is most often found...